1895.] 
215 
A. Alcock— Carcinological Fauna of India. 
Hyastenus gracilirostris , Mi era. 
Hyastenus gracilirostris, Miers, Ann. Mag. Nat. Hist., Yol. IY. 1879, p. 12, pi. iv. 
fig. 7 ; and ‘Challenger’ Brachyura, p. 56. 
Carapace subpyriform, hardly at all setose, with numerous sharp 
tubercles and spinules. Specially noticeable are three spinules, longi¬ 
tudinally arranged in the middle line, on the gastric region, a strong 
conical spine on the cardiac region, a sharp tubercle on the posterior 
margin, and two spines on each of the branchial regions, of which the 
larger occupies the usual position of the lateral epibranchial spine. 
The rostrum, which does not vary according to sex, consists of two 
slender divergent spines, the length of which is about one-third that of 
the carapace. The post-ocular lobe projects very strongly, and the 
supra-ocular eave has both the anterior and the posterior angle pro¬ 
nounced. The basal antennal joint has a well-marked tubercle or blunt 
spine at its antero-external angle. 
The chelipeds in the male are equal in length to the post-rostral 
portion of the carapace, and have a few small granules on the merus 
carpus and upper edge of the palm ; the merus is slender, but the 
palm is broadened and is not much longer than the fingers, which are 
arched and meet only at the tip. In the female the chelipeds are rather 
shorter than the post-ocular portion of the carapace, are very slender, 
and have nearly straight fingers. 
The ambulatory legs are slender, with slender smooth-edged dactyli: 
the first pair are, as usual, much the longest. 
This also is a small species, and egg-laden female of average size 
being only 10 millim. in length. 
In the Museum collection are specimens from the Madras coast. 
'■% Hyastenus tenuicornis , Pocock. 
Hyastenus tenuicornis, Pocock, Ann. Mag. Nat. Hist., Yol. V. 1890, p. 76. 
Distinguished by the enormous length of the rostral spines, and by 
the curious form—described below—of the supra-ocular eave and post¬ 
ocular lobe. 
Carapace subpyriform, somewhat depressed, with the regions well- 
defined ; its surface with many long scattered setae, and with numerous 
granules and some large spines. Specially noticeable are five or seven 
granules, arranged in the form of a cross, on the gastric region ; two 
huge acuminate tubercles, in the middle line, posteriorly; and three 
spines on either branchial region, the hindmost and lowermost of which 
is of great size. 
The rostrum consists of two slender, exceedingly divergent spines, 
